Compilare: user.cpp: In function ‘int main()’: user.cpp:49:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<G[nc].size(); i++) ^ user.cpp:56:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<Gt[nu].size(); j++) ^ user.cpp:89:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<Gt[nc].size(); i++) ^